Amateur talking pictures and recording (1933)

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20 AMATEUR TALKING PICTURES success, but at the present time we can consider that only two have survived. They are aluminium, either in the pure or alloyed state, and a new type of resin having an appearance and characteristics in some ways similar to celluloid. In Chapter III we shall describe a number of varieties of equipment and methods adopted for utilizing these discs. Although the varieties are legion they occupy themselves mainly with the methods employed in effecting the inward movement or traverse of the recording head or electrical pick-up. This may appear a simple point, but it has occupied the time of many inventors.